1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/acpi/sleep/main.c b/drivers/acpi/sleep/main.c
index e2e4e617952b..fdd8139b3f98 100644
--- a/drivers/acpi/sleep/main.c
+++ b/drivers/acpi/sleep/main.c
@@ -139,6 +139,9 @@ static int acpi_pm_enter(suspend_state_t pm_state)
                 break;
         }
 
+        /* Reprogram control registers and execute _BFS */
+        acpi_leave_sleep_state_prep(acpi_state);
+
         /* ACPI 3.0 specs (P62) says that it's the responsabilty
          * of the OSPM to clear the status bit [ implying that the
          * POWER_BUTTON event should not reach userspace ]
@@ -272,6 +275,8 @@ static int acpi_hibernation_enter(void)
         acpi_enable_wakeup_device(ACPI_STATE_S4);
         /* This shouldn't return.  If it returns, we have a problem */
         status = acpi_enter_sleep_state(ACPI_STATE_S4);
+        /* Reprogram control registers and execute _BFS */
+        acpi_leave_sleep_state_prep(ACPI_STATE_S4);
         local_irq_restore(flags);
 
         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
@@ -284,6 +289,8 @@ static void acpi_hibernation_leave(void)
          * enable it here.
          */
         acpi_enable();
+        /* Reprogram control registers and execute _BFS */
+        acpi_leave_sleep_state_prep(ACPI_STATE_S4);
 }
 
 static void acpi_hibernation_finish(void)